1, peach small heartworm. In the northern part of China, 1-2 generations occur each year. Older larvae are used for wintering and wintering in the soil. They are unearthed in mid-May of the next year, unearthed continuously in mid-June, and the mid-to-late June is the period of excavation. In July, adult feathers are produced. Eggs, larvae begin to hatch in the middle of July, the larvae live in the fruit for about 25 days, and the fruit is removed from the fruit, and the second generation continues. After the middle of July, the larvae of the capsules are mostly found in the soil. Overwintering, only one generation occurred.
Prevention:
(1) The tree plate is cultivated or covered with a film. Before the larvae are unearthed, the soil is plucked within 1 m around the trunk and pressed to prevent the larvae from being unearthed. Before mulching, apply 5% phoxim granules to the ground and then simmer.
(2) Appropriate use of drugs. When the rate of fruit is 1-2%, spray control is started. Continuously spray 2-3 times, spray once every 15 days, commonly used agents have 20% pyrethroid 2000-3000 times liquid, 30% Tao Xiaoling 1500 times liquid, carefully careful when spraying.
2, the date is è –. The larvae are the buds, leaves and flower buds of the jujube, which occur one generation a year. They are overwintered in the soil 10-15 cm deep around the crown. In the late March of the next year, they emerge into adult worms. After mating, they lay eggs. Female adults are wingless. Climb to the trunk to lay eggs, after 25 days of egg period, from mid-late April to mid-May, the larvae hatch on the tree, the larvae 1-3 years old, the food is small, the main eating young leaves, 4-5 instar larvae eaten greatly The leaves are often eaten. After the 5th instar development, the larvae begin to enter the soil and go through the summer and winter in the late May to mid June.
Prevention:
(1) Combine deep-plowing soil in winter to remove and kill wintering insects.
(2) In the first ten days of March, a film about 10 cm wide was placed at the base of the trunk at a distance of 20-25 cm from the ground to prevent female adults from laying eggs on the trees. Artificial insects were killed by trees every morning or in the evening, or pyrethroid pesticides were sprayed around the trunks. Kill hatched small larvae.
(3) Spraying and spraying on the tree. If the tree is not completely controlled, and there is still a tree hazard, the agent can be sprayed and treated with 25% chlorpyrifos 2000 times solution.
3, jujube armyworm. Also known as the leaf-leaf worm, the larva damages the leaves, flowers, and fruits, and the jujube sprigs are spun together and the leaves are rolled into dumplings to harm them, or the fruit is plunged into the fruit to eat the flesh, causing the fruit. Fall early. The worm has been in the 3rd generation for 1 year. It is used for wintering under the old skin and in the gap. It will begin to emerge in late March of the next year. It will be feathered in the middle of April and 2-4 days after emergence. After mating, 1-2 The eggs are laid for 10-15 days, the first generation larvae occur in early May, the second generation larvae occur from late June to early July, and the third generation is in mid-August.
Prevention:
(1) Beginning in early September, we will tie grass handles on the trunks, trap the larvae on them for wintering, and collect the straws, burn them or bury them in the winter.
(2) scrape the old skin in the winter to reduce the overwintering insect source.
(3) Spraying prevention and control, grasping the prevention and control of the first generation larvae, spraying and controlling in time of larval attack, using 90% trichlorfon 1000 times solution and 20% killing pyrethroid 3000 times solution alternately, the effect is better.
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